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① memo 20181018 ~ Dredging & Cleaning Polder Waterways ~ Dredging and cleaning ditches and larger waterways – trying to make up for backlog these months – in the polders around Alphen , for water management , flood control – commissioned by The Rijnland District Water Control Board ( Hoogheemraadschap van Rijnland ) – the oldest water board of the Netherlands .

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① memo 20181016 ~ Dredging Dutch Ditches ~ Dredging ditches and larger waterways – trying to make up for backlog these months – in the polders around Alphen , for water management , flood control – commissioned by The Rijnland District Water Control Board ( Hoogheemraadschap van Rijnland ) – the oldest water board of the Netherlands .